Surveyor&#39;s instrument.



J. GEIER.

SURVEYORS INSTRUMENT.

APPLICATION FILED MAR 18, 1914.

1,133,123. Patented M21223, 1915.

2 SHEETS-SHEET 1.

Ill!" J. GEIBR. SURVEYORS INSTRUMENT.

APPLIUATION FILED MAR.18, 1914.

Patented Mar. 23, 1915.-

2 SHBETSSHEET 2.

7166' G eclei a l. Ur 0 l mmmr ME ER; :2

l vmeooeo THE NORRIS PETERS CO. PHOT0-L!THO., WASHINGTON. LL C.

' JAMES amen, OF TROY, NEW roan;

SURVEYORS INSTRUMENT.

Application filed March 1 8, 1914. Serial No. 825,589.

use the same, reference being had to the ac companying drawings, and to letters or fig ures of reference marked thereon which form a part of this specification.

This invention relates to surveyors" instruments and more particularly to that class of surveyors instruments adapted to be used interchangeably.

The object of this invention is to provide an attachment whereby the ordinary surveyors Y level may be interchangeably used as a level or a transit.

A further object of this invention is to.

provide an attachment for a level by means of which the horizontal and vertical angles may be determined.

A still further object of this invention is to provide a level attachment having a vertical arc, tangent clamp, vernier and spirit level in combination therewith.

Vith these and other objects in view, this invention consists in the combination and arrangement of the various detachable mem-.

bers and parts of a combined surveyors level and transit as hereinafter described and more particularly set forth in the appended claims. I

Referring to the drawings forming a portion of this specification wherein similar reference numerals indicate similar parts wherever used: Figure l is a side elevation of a level embodying a portion of this invention. Fig. 2 is a rear elevation of the level used as a transit by means of the attachment. Fig. 3 is a perspective view of the attachment used to convert the level into a transit. Fig. 4 is a rear view of a modification of the device shown in Fig. 3. Fig. 5 is a detail perspective View of the attachment placed on the barrel of the level telescope to cooperate with the transit attachment.

The numeral 6 designates an ordinary surveyors or architects Y level telescope provided with the usual beam 7 and adjusting means 8, 9 and 10, the usual graduated circle 11, the corresponding vernier'12 and Specification of Letters Patent.

Patented Mar. 23, 1915.

the supporting Ys 13 and 14. Secured to the level telescope at the longitudinal center thereof is a semi-circular band 15. secured in place upon the telescope barrel by means of screws 16 and'l7. 'The band 15 has four projections 18, 19, 20 and 21, extending from the corners thereof and so bent as to follow the contour of the telescope barrel and tolie in contact therewith. On theupper edge of the telescope is a small lug. 22, of which will be, hereinafter explained. Provided in the beam 7 is a central screw threaded recess 23.

The attachment cooperating with the the function above described means to convert the level into a transit is more particularly illustrated p in Figs. .3 and andcoinprises a base. 24; provided with athumb screw 25 and having upwardly extending arms 26 and 27, termina-ting in semi-circular bearings 28 and 29. Supported in tnese bearings by means of stub pivots 30 and 31 is a removable U- shaped yoke 32 having internal shouldersy52 and 53 and which carries-a pivoted closure block 33 having a central aperture 34; and a bifurcated end 35 adapted to receive a pivoted set screw 36 on the opposite arm fthe U yoke. In order to accommodate any size of level telescope the yoke 32 is provided ad 'Jacent the shoulders 52 and with set screwsfi-i and 55. A further set screw 56 may be provided in the. aperture 34 of the closure 33. This is a modification of the inventionand is illustrated. only in Fig. 4. y

The bearings areclosed by means; of bearing blocks 37' and 38 which areprovided with suitable screws adapted to fasten the blocks to the bearings. This construction leaves the yolre 32 free to swing upon the standards 26 and 27. Secured to the outer side of the arm 27 is a vernier 39 and belowv the vernier is a small spirit lev l 40. The standard 26 has formed integral therewith a lug 41 hereinafter referred to. Stubshaft 31 carries upon its end outside the arm 27 a "removable vertical are 42 held in place upon the shaft by means of a screw This.

vertical arc is so placed as to cooperate with the Vernier 39. Supported outside ofthe arm26 upon the stub shaft 30 by means of a split collar 44,.the size of which is regulated by a set screw 45 is a member 46 having bear-ing members 4-7 and 48 formed thereon. Passing through the bearing 47 and. abutting against the lug 4:10f the standard 26 is a set screw as. Extending through the bearing e18 and abutting against the other side of l I'" 1' V i I the lug ll is a rod ad which against a spring contained wit'iin a cylinder 51 which is screw threaded into the hearings as. By 5 operating the set scr w the member i6 is made to move, using the shaft 30 as a cent r and either causing the shaft more or moving ree upon said shaft according to whether the split ring l i is tight or loose 10 upon the shaft 30.

The operation of this device is as follows: When used as a level the telescope is placed in the We as shown in Fig. 1. l Vhen it is desired to convert the instrument for use as a transit the telescope is removed from the We and the attachment siiown in Figs. 3 and a placed upon the beam 7 as shown in Fig. 2. The set screw 25 is screwed tightly within the threaded recess 23. The telescope 5 is placed in position within the yoke the shoulders 52 and of the yoke receiving the telescope and the four projections 18, 19, 20 and of the hand 15 upon the telescope engage the outer edges of each of the sides of the yoke 32, thus preventin any i ngitudinal movement of the telescope. T he space 5a in the yoke 32 receives the usual spirit level carried by the telescope. The block 33 is now fastened in place by means of the screw 36, the lug 22 engaging the aperture 3 lto prevent any lateral movement of the telescope. i ingular adjustment of the instrument is accomplished by means of the screw lf) which acts as a tangent in common with the member 4:6 and the split ring A acting upon the shaft 30. The readings for the angles may be ascertained. upon the arc i2 in connection with the vernier and the entire instrument operated as a transit.

40 Considerable variation from the details as herein described may be practised without departing from the spirit of this invention, and it is intended to construe the claims not only in the light of the foregoing, but as broadly as the state of the prior art will permit.

b U. a. Letters Patent, 1,

1. A transit attachment comprising in combination a plurality of standards, a telescope support mounted on said standasaid support comprising a U-yoke prov'i with internal shoulders adapted to rec-sire the telescope, means for closing the open end of the U-yoke and means carried by said yoke adjacent said shoulders adapted hold a telescope in said position.

2. l transit attachment comp-rising in combination a plurality of standards, a L scope support mounted on said standard said support compri nga L -yoke provided with internal shoulders adapted to receive a telescope, means carried by said yoke a A ed to hold telescope position, said means comprising a pivoted block having a hiiurcatcd end, and set screw engagi g said en to hold said block against the telescope, an adjustable means carried by the yoke adjacent said shoulders adapted to receive vari ous sized telescopes.

In a convertible "r" level, the comhina tion with a telescope, of band secured thereto, a leg formed at each corner band, means for supporting the te for use as a transit, said means compris a base having upwardly extending are provided with hearings, a U-yoke adapt to receive the band on said telescope, the legs of said band engaging the outer 01 said yoke, adjustable means adjacent said shoulders adapted to engage the telescope, means for closing the open end of said yo i and means for car ing the angle of the y and the telescope.

in testimony wl'iereo'li l have signed ni -J name to this specification in the presence of two subscribing witnesses.

JAMES 'llElElt,

lVitnesses RASMUS NIELSEN, Josnrr-r BLUHNY.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

